The shape of [Cu(NH3)4]2+ is square planar, hybridization of Cu2+

The shape of [Cu(NH3)4]2+ is square planar, hybridization of Cu2+ in this complex is ?? Give the full explanation !!

Shape of the complex is square planar which arises due to dsp2 hybridisation. Hybridisation of one 4s, two 4p and one 4d orbitals takes place (dsp2) to give square planar shape.